Il 26/11/2013 05:05, Fam Zheng ha scritto:
+ if (backing_bs && *backing_bs != '\0') {
+ bs->backing_hd = bdrv_find(backing_bs);
+ if (!bs->backing_hd) {
+ error_setg(errp, "Backing device not found: %s", backing_bs);
+ return -ENOENT;
+ }
+ bdrv_ref(bs->backing_hd);
+ assert(!bs->backing_blocker);
+ error_setg(&bs->backing_blocker,
+ "device is used as backing hd of '%s'",
+ bs->device_name);
+ bdrv_op_block_all(bs->backing_hd, bs->backing_blocker);
Why should this blocker only apply to the "named backing file" case, and
not to all backing files?